"After many years of testing, VoIP is finally ready, and major industry players are committing to mass-market deployment of their VoIP services," The Yankee Group said in a statement. The success of Vonage, which now dominates the U.S. VoIP market, has spurred a dramatic response from major telephony players. AT&T, Verizon and Qwest have committed to local VoIP rollout strategies for 2004, the market research firm said.